Air cylinder assembly of hydrogen compressor and hydrogen compressor

Abstract

The utility model discloses an air cylinder assembly of a hydrogen compressor and the hydrogen compressor, and belongs to the technical field of gas pressurizing equipment, the air cylinder assembly comprises a cylinder body and a piston rod arranged in a rod hole of the cylinder body, and further comprises a sealing assembly used for axially sealing a gap between the rod hole and the piston rod, the sealing assembly comprises a liquid sealing cavity formed in the cylinder body, the sealing assembly further comprises packing sealing assemblies, the packing sealing assemblies are arranged on the two sides of the liquid sealing cavity, each packing sealing assembly comprises a flexible packing ring installed on the cylinder body, and the piston rod penetrates through a center hole of the flexible packing ring. An annular closed cavity is defined by the outer side of the flexible packing ring and the cylinder body, the cylinder body is further provided with a flow path used for introducing a pressure medium into the closed cavity, and the hydrogen compressor comprises the air cylinder assembly. According to the scheme, the ionic liquid is used for sealing, lubricating and cooling the sealing position, and meanwhile the good axial sealing effect is still achieved under the vibration working condition of the compressor.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pressurization equipment, in particular to a cylinder assembly of a hydrogen compressor and a hydrogen compressor. Background Art

[0002] The hydrogen compressor is a key equipment for hydrogen energy utilization, which is determined by the pressure requirements of the medium (liquid / gas) after pressurization. The hydrogen compressor has the characteristics of a large compression ratio. At the same time, due to the wide explosion limit of hydrogen, for a piston-type hydrogen compressor, the hydrogen leakage rate during its working process is a key parameter that needs to be focused on during the design of the hydrogen compressor. In the prior art, the commonly used forms of hydrogen compressors include piston type and diaphragm type. Among them, the piston-type hydrogen compressor is widely used in the hydrogen compression stage with an outlet pressure lower than 25 Mpa due to its low use cost and large gas output. Considering the maintenance cost, vibration, noise, and failure rate of the compressor during the working process, higher-pressure pressurization is generally completed by a diaphragm-type hydrogen compressor.

[0003] According to the different driving forms of the piston-type hydrogen compressor, the commonly used driving forms of the piston-type hydrogen compressor include crankshaft connecting rod drive and hydraulic drive. No matter what driving form it is, the piston rod in the hydrogen compressor has the characteristic of reciprocating movement in the cylinder block, and the clearance between the piston rod and the hole in the cylinder block is also the main leakage position of the piston-type hydrogen compressor. In the prior art, for the axial seal of the above positions, the specific sealing schemes adopted include packing seal, medium seal, or a combination of packing seal and medium seal. At the same time, the medium includes liquid medium (such as ionic liquid) and gas medium (such as nitrogen or pressurized hydrogen). The specific technical solutions are as provided in patent application documents such as the patent applications with application numbers CN201310361392.X, CN201310361392.X, and CN202410378107.3.

[0004] The axial sealing effect of the piston rod is an important guarantee for the normal operation of the piston-type hydrogen compressor. Therefore, it is necessary to further optimize the related technology. Summary of the Utility Model

[0005] Aiming at the above-mentioned technical problem of further optimizing the axial seal of the piston rod in the piston-type hydrogen compressor, the utility model provides a cylinder assembly of a hydrogen compressor and a hydrogen compressor. This solution not only uses ionic liquid to seal, lubricate, and cool the sealing position, but also has a good axial sealing effect under the vibration condition of the compressor.

[0006] In view of the above problems, a cylinder assembly of a hydrogen compressor and a hydrogen compressor provided by the present utility model solve the problems through the following technical points: A cylinder assembly of a hydrogen compressor includes a cylinder block and a piston rod disposed in the rod hole of the cylinder block, and further includes a sealing assembly for axially sealing the gap between the rod hole and the piston rod. The sealing assembly includes a liquid sealing cavity provided on the cylinder block, and the sealing assembly further includes a packing sealing assembly. Packing sealing assemblies are provided on both sides of the liquid sealing cavity. The packing sealing assembly includes a flexible packing ring mounted on the cylinder block. The piston rod passes through the central hole of the flexible packing ring. An annular closed cavity is formed between the outer side of the flexible packing ring and the cylinder block. A flow path for introducing a pressure medium into the closed cavity is further configured on the cylinder block.

[0007] In the prior art, in order to achieve axial sealing of the gap between the upper cylinder block and the piston rod of a piston-type hydrogen compressor, the corresponding sealing assembly includes a ring-shaped liquid sealing cavity provided in the rod hole to inject ionic liquid into the liquid sealing cavity to achieve the purposes of sealing, lubrication, and cooling, and packing sealing assemblies are provided on both sides of the liquid sealing cavity. For example, the packing sealing assembly between the liquid sealing cavity and the piston cavity serves as a front-stage seal to reduce the pressure on the front side of the liquid sealing cavity, so as to reduce the requirement for the pressure of the ionic liquid in the liquid sealing cavity. The packing sealing assembly on the other side of the liquid sealing cavity serves as a rear-stage seal of the liquid sealing cavity to prevent the axial leakage of the ionic liquid to the side where the driving mechanism of the piston rod is located. However, the packing sealing assembly generally used in the prior art is a packing ring pre-installed between the rod hole and the piston rod. For example, the packing ring is clamped in a ring groove coaxial with the rod hole. The inner side of the packing ring is in contact with the piston rod and is pressed by the piston rod. The outer side of the packing ring is in contact with the bottom of the ring groove and is pressed by the bottom of the groove. The left and right sides of the packing ring are respectively in contact with and pressed by the corresponding side surfaces of the ring groove. That is, the pressure of the packing ring on the sealing surface depends on the pressure of the piston rod and the cylinder block on the packing ring. Especially when a crosshead slider is used to drive the piston rod to reciprocate, the piston rod has radial vibration during operation. When the packing ring ages or the wear amount is too large, the clamping force of the piston rod and the cylinder block on the packing ring may not be able to force the packing ring to timely fill the leakage gap generated by the vibration. For example, when the horizontally arranged piston rod vibrates upward relative to the cylinder block, it will force a leakage gap to appear between the lower side of the piston rod and the packing ring, and the force of the cylinder block on the packing ring may not be able to force the packing ring to fill the leakage gap. The appearance of this gap will cause the sealing performance of the sealing assembly to deteriorate, affecting the reliability of axial sealing of the gap between the rod hole and the piston rod.

[0008] The differences between this solution and the prior art include: for the packing sealing components on both sides of the liquid sealing cavity, a flexible packing ring is configured as the corresponding packing ring, and the outer side of the flexible packing ring has a closed cavity surrounded by the cylinder body, and the cylinder body has a flow path for introducing the pressure medium into the closed cavity. In this way, when this solution is used, the pressure medium is introduced into the closed cavity through the fluid, and the pressure medium generates pressure toward the piston rod at each position outside the flexible packing ring. The magnitude of the pressure is determined by the pressure of the pressure medium in the closed cavity. When the inner side of the flexible packing ring is more worn, the elastic recovery ability of the flexible packing ring decreases, and the radial amplitude of the piston rod is large, the flexible packing ring can be strengthened by increasing the medium pressure in the closed cavity. The ability of the flexible packing ring to close the leakage gap between it and the piston rod under the action of the medium pressure enables the inner side of the flexible packing ring to always maintain a sufficient sealing pressure ratio with the outer side of the piston rod to ensure the axial sealing effect. Therefore, different from the traditional packing scheme, this scheme uses ionic liquid to seal, lubricate and cool the sealing position. At the same time, for the packing sealing components on both sides of the liquid sealing cavity, the packing sealing components are arranged so that the packing sealing components can change the pressure of the medium introduced into the closed cavity through the flow path according to the actual working conditions of the cylinder assembly, and dynamically adjust the ability of the flexible packing ring to fill the possible leakage gap, so that the piston compressor used for hydrogen compression still has a good rod hole axial sealing effect under the condition of radial vibration of the piston rod.

[0009] In a specific implementation, if the medium is liquid, in order to avoid contamination of the ionic liquid by the medium and to reduce the cost of using the medium, it is preferred that the medium introduced into the closed cavity through the flow path is gas, such as the flow path is connected to the outlet side of the compressor through an air duct, and a proportional pressure reducing valve is provided on the air duct, that is, compressed hydrogen is used as the pressure gas for sealing the flexible packing ring, and the gas pressure in the closed cavity can change with the outlet pressure of the compressor to match the specific sealing needs at each moment.

[0010] Regarding the sealing assembly, taking the example where a sliding cavity for the crosshead slider to slide is provided at the rear end of the cylinder block and a piston cavity for the piston assembly to slide is provided at the front end, three spaced annular grooves can be provided on the rod hole: from the rear end to the front end, they are the first annular groove, the second annular groove, and the third annular groove respectively. The second annular groove serves as the liquid sealing cavity. A first packing ring in the form of a flexible packing ring is provided in the first annular groove, and a second packing ring in the form of a flexible packing ring is provided in the third annular groove. The first annular groove and the first packing ring therein form a packing sealing assembly on one side of the liquid sealing cavity, and the third annular groove and the second packing ring therein form a packing sealing assembly on the other side of the liquid sealing cavity. In specific implementation, the flexible packing ring preferably adopts an integrally formed annular structure, such as a rubber ring, and an annular groove coaxial with the annular structure is provided on the outer side of the annular structure to enhance the sealing effect between the side surfaces of the flexible packing ring and the side surfaces of the annular groove under the medium pressure.

[0011] As a further technical solution of the hydrogen compressor cylinder assembly:

[0012] The packing sealing assembly includes an annular groove provided on the cylinder block. The annular groove extends in the circumferential direction around the rod hole, and the inner side of the annular groove is connected to the rod hole;

[0013] The flexible packing ring is arranged in the annular groove. In the axial direction of the piston rod, the two sides of the flexible packing ring are respectively in contact with different side surfaces of the annular groove. In the radial direction of the piston rod, the piston rod is located inside the flexible packing ring, and the outer side of the flexible packing ring and the annular groove enclose the closed cavity;

[0014] One end of the flow path is located on the side surface of the cylinder block, and the other end of the flow path is connected to the closed cavity. This solution provides a specific implementation manner of the packing sealing assembly. The annular groove is the annular groove on the rod hole as described above, and the flow path is to introduce the corresponding medium from the outside of the cylinder block into the closed cavity.

[0015] The liquid sealing cavity is an annular cavity coaxial with the rod hole. The cylinder block is also provided with a liquid inlet channel for supplying liquid to the liquid sealing cavity and a liquid outlet channel for discharging liquid from the liquid sealing cavity;

[0016] It further includes a circulation pipeline. The liquid inlet channel, the liquid sealing cavity, and the liquid outlet channel are all connected in series on the circulation pipeline. A temporary storage tank and a circulation pump are also connected in series on the circulation pipeline. The circulation pump is used to extract the ionic liquid from the temporary storage tank and inject the ionic liquid into the liquid sealing cavity. The temporary storage tank is used to store the liquid discharged from the liquid sealing cavity. In this solution, the liquid inlet channel is used to introduce the ionic liquid into the liquid sealing cavity, and the liquid outlet channel is the channel for discharging the ionic liquid from the liquid sealing cavity. By adopting this solution, the ionic liquid in the liquid sealing cavity can be made to flow, so as to ensure the sealing, lubrication, and cooling effects of the ionic liquid. Further, the circulation pipeline is provided to realize the recycling of the ionic liquid: the ionic liquid discharged from the liquid outlet channel is temporarily stored in the temporary storage tank, and the temporary storage tank can be used for cooling the ionic liquid and precipitating abrasive particles. The circulation pump is used to inject the ionic liquid in the temporary storage tank into the liquid sealing cavity through the liquid inlet channel.

[0017] An ionic liquid recovery cavity is provided at one end of the cylinder block away from the piston cavity, and the packing seal assembly at this end is located between the ionic liquid recovery cavity and the liquid sealing cavity;

[0018] An ionic liquid recovery liquid path is also provided on the cylinder block. The inlet of the ionic liquid recovery liquid path is communicated with the ionic liquid recovery cavity, and the outlet of the ionic liquid recovery liquid path is connected to one end of a recovery pipeline. The other end of the recovery pipeline is arranged to introduce the ionic liquid in the recovery pipeline into the temporary storage tank. This solution is as follows: the side of the liquid sealing cavity close to the piston cavity is the high-pressure side, and the side of the liquid sealing cavity close to the sliding cavity is the low-pressure side. A better application is that the pressure of the ionic liquid in the liquid sealing cavity is greater than or equal to the pressure at the rear end of the packing seal assembly on its high-pressure side. The pressure of the ionic liquid in the liquid sealing cavity is less than the outlet gas pressure of the piston cavity. To reduce the wear of the packing seal assembly on the low-pressure side of the liquid sealing cavity, the ionic liquid in the liquid sealing cavity can have a leakage direction towards the sliding cavity side. On this basis of application, it is provided that it further includes the ionic liquid recovery cavity. The ionic liquid recovery cavity can be the sliding cavity or a separate cavity structure. For example, this cavity structure is located between the sliding cavity and the first ring groove. In this way, the ionic liquid passing through the packing seal assembly on the low-pressure side enters the ionic liquid recovery cavity and is then introduced into the temporary storage tank through the ionic liquid recovery liquid path and the recovery pipeline, so as to realize the reuse of this part of the ionic liquid.

[0019] A pressure regulating valve is connected in series on the circulation pipeline between the liquid outlet channel and the temporary storage tank. In this solution, through the throttling effect of the pressure regulating valve, the pressure of the ionic liquid in the liquid sealing cavity is controlled and changed, so that the pressure of the ionic liquid in the liquid sealing cavity can adapt to the pressure change at the rear end of the packing seal assembly on the high-pressure side of the liquid sealing cavity according to different operating conditions of the compressor and the axial sealing conditions.

[0020] A third packing ring is arranged in the gap at one end of the cylinder body close to the piston cavity, and the packing seal assembly at this end of the cylinder body is located between the liquid sealing cavity and the third packing ring;

[0021] It also includes a packing pressure ring for providing compression to the third packing ring, and the packing pressure ring is installed on the cylinder body through a clamping bolt. In this solution, the third packing ring is used as a packing sealing structure based on the end pressure ring compression, and the third packing ring is arranged in front of the packing sealing assembly on the high-pressure side of the liquid sealing chamber to reduce the air pressure at the front end of the packing sealing assembly, so as to protect the packing sealing assembly and extend the service life of the packing sealing assembly.

[0022] The present solution also relates to a hydrogen compressor, comprising the hydrogen compressor cylinder assembly as described in any one of the above. The present solution is a hydrogen compressor using the hydrogen compressor cylinder assembly.

[0023] As a further technical solution of the hydrogen compressor:

[0024] It also includes a driving mechanism for driving the piston rod to reciprocate, and the driving mechanism includes a crosshead slider connected to the piston rod and slidably matched in the cylinder body. This solution is to provide a hydrogen compressor whose driving mechanism is a crank-connecting rod driving mechanism. Compared with a hydraulically driven hydrogen compressor, this type of hydrogen compressor is not only simple in structure and high in working efficiency, but also, from the perspective of radial vibration of the piston rod, the cylinder assembly provided by this solution can better solve the corresponding axial sealing problem.

[0025] The flow path is connected to the outlet side of the hydrogen compressor through the air guide pipe. This solution solves the problem of the source of pressure medium in the closed cavity through the outlet of the hydrogen compressor, which is conducive to simplifying the overall structure of the compressor and making the air pressure of the pressure medium self-adaptive to the axial sealing requirements.

[0026] The air guide pipe is also connected in series with a pressure reducing valve. This solution is to use the pressure reducing valve to control the medium pressure in the closed cavity, and to reasonably control the medium pressure in the closed cavity to reduce the wear rate of the flexible packing ring while meeting the axial sealing requirements.

[0027] The utility model has the following beneficial effects:

[0028] While utilizing ionic liquid to achieve sealing, lubrication and cooling of the sealing position, the present solution arranges the packing seal components on both sides of the liquid sealing cavity so that the packing seal components can change the pressure of the medium introduced into the closed cavity through the flow path according to the actual working conditions of the cylinder assembly, and dynamically adjust the ability of the flexible packing ring to fill possible leakage gaps, so that the piston compressor used for hydrogen compression still has a good rod hole axial sealing effect under conditions such as radial vibration of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a cross-sectional view of a specific embodiment of a hydrogen compressor cylinder assembly according to this solution, where the arrows indicate the flow direction of the ionic liquid in the corresponding pipelines.

[0030] The reference numerals in the drawings are respectively: 1, cylinder block; 2, piston rod; 3, liquid seal cavity; 4, first packing ring; 5, second packing ring; 6, third packing ring; 7, packing compression ring; 8, circulation pipeline; 9, temporary storage tank; 10, circulation pump; 11, piston assembly; 12, pressure regulating valve; 13, annular groove; 14, flow path; 15, recovery pipeline; 16, crosshead slider. Specific embodiments

[0031] The present utility model will be further described in detail below in conjunction with embodiments, but the present utility model is not limited to the following embodiments:

[0032] Embodiment 1:

[0033] As Figure 1 shown, a hydrogen compressor cylinder assembly includes a cylinder block 1 and a piston rod 2 disposed in the rod hole of the cylinder block 1, and further includes a sealing assembly for axially sealing the gap between the rod hole and the piston rod 2. The sealing assembly includes a liquid seal cavity 3 disposed on the cylinder block 1. The sealing assembly further includes a packing sealing assembly. Packing sealing assemblies are disposed on both sides of the liquid seal cavity 3. The packing sealing assembly includes a flexible packing ring mounted on the cylinder block 1. The piston rod 2 passes through the central hole of the flexible packing ring. The outer side of the flexible packing ring and the cylinder block 1 enclose an annular closed cavity. The cylinder block 1 is further configured with a flow path 14 for introducing a pressure medium into the closed cavity.

[0034] In the prior art, to achieve axial sealing of the gap between the upper cylinder body 1 and the piston rod 2 of a piston-type hydrogen compressor, the corresponding sealing assembly includes a ring-shaped liquid sealing cavity 3 provided in the rod hole. By injecting ionic liquid into the liquid sealing cavity 3, the purposes of sealing, lubrication, and cooling can be achieved. Packing sealing assemblies are provided on both sides of the liquid sealing cavity 3. For example, the packing sealing assembly between the liquid sealing cavity 3 and the piston cavity serves as a front-stage seal to reduce the pressure on the front side of the liquid sealing cavity 3, thereby reducing the requirements for the pressure of the ionic liquid in the liquid sealing cavity 3. The packing sealing assembly on the other side of the liquid sealing cavity 3 serves as a rear-stage seal for the liquid sealing cavity 3 to prevent axial leakage of the ionic liquid to the side where the driving mechanism of the piston rod 2 is located. However, the packing sealing assembly used in the prior art is generally a packing ring pre-installed between the rod hole and the piston rod 2. For example, the packing ring is clamped in a ring groove coaxial with the rod hole. The inner side of the packing ring is in contact with the piston rod 2 and is squeezed by the piston rod 2. The outer side of the packing ring is in contact with the bottom of the ring groove and is squeezed by the bottom of the groove. The left and right sides of the packing ring are respectively in contact with and squeezed by the corresponding sides of the ring groove. That is, the pressure of the packing ring on the sealing surface depends on the pressure of the piston rod 2 and the cylinder body 1 on the packing ring. Especially when the crosshead slider 16 is used to drive the piston rod 2 to reciprocate, the piston rod 2 vibrates in the radial direction during operation. When the packing ring ages or the wear amount is too large, there is a situation where the clamping force of the piston rod 2 and the cylinder body 1 on the packing ring cannot force the packing ring to timely fill the leakage gap generated by the vibration. For example, when the horizontally arranged piston rod 2 vibrates upward relative to the cylinder body 1, a leakage gap will be forced to appear between the lower side of the piston rod 2 and the packing ring, and the acting force of the cylinder body 1 on the packing ring cannot force the packing ring to fill this leakage gap. The appearance of this gap will cause the sealing performance of the sealing assembly to deteriorate, affecting the reliability of axial sealing of the gap between the rod hole and the piston rod 2.

[0035] The differences between this solution and the prior art include: for the packing sealing components on both sides of the liquid sealing cavity 3, a flexible packing ring is configured as the corresponding packing ring, and the outer side of the flexible packing ring has a closed cavity surrounded by the cylinder body 1, and the cylinder body 1 has a flow path 14 for introducing the pressure medium into the closed cavity. In this way, when this solution is used, the pressure medium is introduced into the closed cavity through the fluid, and the pressure medium generates pressure toward the piston rod 2 at each position outside the flexible packing ring. The magnitude of the pressure is determined by the pressure of the pressure medium in the closed cavity. When the inner side of the flexible packing ring is more worn, the elastic recovery ability of the flexible packing ring decreases, and the radial amplitude of the piston rod 2 is large, the flexible packing ring can be strengthened by increasing the medium pressure in the closed cavity. The ability of the flexible packing ring to close the leakage gap between it and the piston rod 2 under the action of the medium pressure enables the inner side of the flexible packing ring to always maintain a sufficient sealing pressure ratio with the outer side of the piston rod 2 to ensure the axial sealing effect. Therefore, different from the traditional packing scheme, this scheme uses ionic liquid to achieve sealing, lubrication and cooling of the sealing position. At the same time, for the packing sealing components on both sides of the liquid sealing cavity 3, it is arranged that the packing sealing components can change the pressure of the medium introduced into the closed cavity through the flow path 14 according to the actual working conditions of the cylinder assembly, and dynamically adjust the ability of the flexible packing ring to fill the possible leakage gap, so that the piston compressor used for hydrogen compression still has a good rod hole axial sealing effect under the condition of radial vibration of the piston rod 2.

[0036] In a specific implementation, if the medium is liquid, in order to avoid the medium causing contamination of the ionic liquid and to reduce the cost of using the medium, it is preferred that the medium introduced into the closed cavity through the flow path 14 is gas. For example, the flow path 14 is connected to the air outlet side of the compressor through an air duct, and a proportional pressure reducing valve is provided on the air duct, that is, compressed hydrogen is used as the pressure gas for sealing the flexible packing ring, and the gas pressure in the closed cavity can change with the change of the compressor outlet pressure to match the specific sealing needs at each moment.

[0037] Regarding the sealing assembly, taking the example where a sliding cavity for the crosshead slider 16 to slide is provided at the rear end of the cylinder block 1 and a piston cavity for the piston assembly 11 to slide is provided at the front end, three spaced annular grooves can be provided on the rod hole: from the rear end to the front end, they are the first annular groove, the second annular groove, and the third annular groove respectively. The second annular groove serves as the liquid sealing cavity 3, the first packing ring 4 which is a flexible packing ring is arranged in the first annular groove, the second packing ring 5 which is a flexible packing ring is arranged in the third annular groove. The first annular groove and the first packing ring 4 therein form a packing sealing assembly on one side of the liquid sealing cavity 3, and the third annular groove and the second packing ring 5 therein form a packing sealing assembly on the other side of the liquid sealing cavity 3. In specific implementation, the flexible packing ring preferably adopts an integrally formed annular structure, such as a rubber ring, and an annular groove coaxial with the annular structure is provided on the outer side of the annular structure, so as to enhance the sealing effect between the side surfaces of the flexible packing ring and the side surfaces of the annular groove under the medium pressure.

[0038] Embodiment 2:

[0039] This embodiment is further refined on the basis of Embodiment 1:

[0040] The packing sealing assembly includes an annular groove 13 provided on the cylinder block 1. The annular groove 13 extends in the circumferential direction around the rod hole, and the inner side of the annular groove 13 is connected to the rod hole;

[0041] The flexible packing ring is arranged in the annular groove 13. In the axial direction of the piston rod 2, both sides of the flexible packing ring are respectively in contact with different side surfaces of the annular groove 13. In the radial direction of the piston rod 2, the piston rod 2 is located inside the flexible packing ring, and the outer side of the flexible packing ring and the annular groove 13 enclose the closed cavity;

[0042] One end of the flow path 14 is located on the side surface of the cylinder block 1, and the other end of the flow path 14 is connected to the closed cavity. This solution provides a specific implementation manner of the packing sealing assembly. The annular groove 13 is the annular groove on the rod hole as above, and the flow path 14 is to introduce the corresponding medium from the outside of the cylinder block 1 into the closed cavity.

[0043] Embodiment 3:

[0044] This embodiment is further refined on the basis of Embodiment 1:

[0045] The liquid sealing cavity 3 is an annular cavity coaxial with the rod hole. The cylinder block 1 is further provided with a liquid inlet channel for supplying liquid to the liquid sealing cavity 3 and a liquid outlet channel for discharging liquid from the liquid sealing cavity 3;

[0046] It further includes a circulation pipeline. The liquid inlet channel, the liquid sealing cavity 3, and the liquid outlet channel are all connected in series on the circulation pipeline. A temporary storage tank 9 and a circulation pump 10 are also connected in series on the circulation pipeline. The circulation pump 10 is used to extract the ionic liquid from the temporary storage tank 9 and inject the ionic liquid into the liquid sealing cavity 3. The temporary storage tank 9 is used to store the liquid discharged from the liquid sealing cavity 3. In this solution, the liquid inlet channel is used to introduce the ionic liquid into the liquid sealing cavity 3, and the liquid outlet channel is the channel for the ionic liquid to be discharged from the liquid sealing cavity 3. By adopting this solution, the ionic liquid in the liquid sealing cavity 3 can be made to flow, so as to ensure the sealing, lubrication, and cooling effects of the ionic liquid. Further, the circulation pipeline is provided to realize the recycling of the ionic liquid: the ionic liquid discharged from the liquid outlet channel is temporarily stored in the temporary storage tank 9, and the temporary storage tank 9 can be used for cooling the ionic liquid and precipitating abrasive particles. The circulation pump 10 is used to inject the ionic liquid in the temporary storage tank 9 into the liquid sealing cavity 3 through the liquid inlet channel.

[0047] Embodiment 4:

[0048] This embodiment is further refined on the basis of Embodiment 3:

[0049] An ionic liquid recovery cavity is provided at one end of the cylinder block 1 away from the piston cavity, and the packing seal assembly at this end is located between the ionic liquid recovery cavity and the liquid sealing cavity 3;

[0050] An ionic liquid recovery liquid path is also provided on the cylinder block 1. The inlet of the ionic liquid recovery liquid path communicates with the ionic liquid recovery cavity, and the outlet of the ionic liquid recovery liquid path is connected to one end of the recovery pipeline 15. The other end of the recovery pipeline 15 is arranged to introduce the ionic liquid in the recovery pipeline 15 into the temporary storage tank 9. This solution is as follows: the side of the liquid sealing cavity 3 close to the piston cavity is the high-pressure side, and the side of the liquid sealing cavity 3 close to the sliding cavity is the low-pressure side. A better application is that the pressure of the ionic liquid in the liquid sealing cavity 3 is greater than or equal to the pressure at the rear end of the packing seal assembly on its high-pressure side, and the pressure of the ionic liquid in the liquid sealing cavity 3 is less than the outlet gas pressure of the piston cavity. To reduce the wear of the packing seal assembly on the low-pressure side of the liquid sealing cavity 3, the ionic liquid in the liquid sealing cavity 3 can have a leakage direction towards the sliding cavity side. On this basis of application, it is provided that it further includes the ionic liquid recovery cavity. The ionic liquid recovery cavity can be the sliding cavity or a separate cavity structure. For example, this cavity structure is located between the sliding cavity and the first ring groove. In this way, the ionic liquid passing through the packing seal assembly on the low-pressure side enters the ionic liquid recovery cavity and is then introduced into the temporary storage tank 9 through the ionic liquid recovery liquid path and the recovery pipeline 15, so as to realize the reuse of this part of the ionic liquid.

[0051] Embodiment 5:

[0052] This embodiment is further refined on the basis of Embodiment 3:

[0053] A pressure regulating valve 12 is connected in series on the circulation pipeline 8 between the liquid outlet channel and the temporary storage tank 9. In this solution, through the throttling effect of the pressure regulating valve 12, the pressure of the ionic liquid in the liquid seal cavity 3 is controlled and changed, so that the pressure of the ionic liquid in the liquid seal cavity 3 can adapt to the pressure changes at the rear end of the packing seal assembly on the high-pressure side of the liquid seal cavity 3 under different operating conditions of the compressor and the axial seal condition.

[0054] Example 6:

[0055] This example is further refined on the basis of Example 1:

[0056] A third packing ring 6 is arranged in the gap at one end of the cylinder block 1 close to the piston cavity, and the packing seal assembly at this end of the cylinder block 1 is located between the liquid seal cavity 3 and the third packing ring 6;

[0057] It also includes a packing gland 7 for providing extrusion to the third packing ring 6, and the packing gland 7 is installed on the cylinder block 1 through a compression bolt. In this solution, the third packing ring 6 is a packing seal structure based on the compression of the end gland. The third packing ring 6 is arranged in front of the packing seal assembly on the high-pressure side of the liquid seal cavity 3 to reduce the air pressure at the front end of the packing seal assembly, so as to protect the packing seal assembly and extend its service life.

[0058] Example 7:

[0059] On the basis of Example 1, this example provides a hydrogen compressor, which includes the hydrogen compressor cylinder assembly as described in Example 1. This solution is a hydrogen compressor using the hydrogen compressor cylinder assembly.

[0060] Example 8:

[0061] This example is further refined on the basis of Example 7:

[0062] It also includes a driving mechanism for driving the piston rod 2 to reciprocate. The driving mechanism includes a crosshead slider 16 connected to the piston rod 2 and slidingly fitted in the cylinder block 1. This solution provides a hydrogen compressor with a crank-link driving mechanism. Compared with a hydraulically driven hydrogen compressor, this type of hydrogen compressor not only has a simple structure and high working efficiency, but also, from the perspective of the radial vibration of the piston rod 2, the cylinder assembly provided by this solution can better solve the corresponding axial seal problem.

[0063] Example 9:

[0064] This example is further refined on the basis of Example 7:

[0065] The flow path 14 is communicated with the outlet side of the hydrogen compressor through a gas duct. This solution is to solve the problem of the pressure medium source in the closed cavity through the outlet of the hydrogen compressor, which is beneficial to simplifying the overall structure of the compressor and enabling the air pressure of the pressure medium to adapt to the axial seal requirement.

[0066] Embodiment 10:

[0067] This embodiment is further refined on the basis of Embodiment 9:

[0068] A pressure reducing valve is also connected in series on the gas duct. This solution is to control the medium pressure in the closed cavity by using the pressure reducing valve, and by reasonably controlling the medium pressure in the closed cavity, the wear rate of the flexible packing ring can be reduced while meeting the axial seal requirement.

[0069] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, other embodiments obtained without departing from the technical solution of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrogen compressor cylinder assembly, comprising a cylinder block (1) and a piston rod (2) disposed in the rod hole of the cylinder block (1), further comprising a sealing assembly for axially sealing the gap between the rod hole and the piston rod (2), the sealing assembly comprising a liquid sealing cavity (3) disposed on the cylinder block (1), the sealing assembly further comprising a packing sealing assembly, and packing sealing assemblies are disposed on both sides of the liquid sealing cavity (3), characterized in that, The packing seal assembly includes a flexible packing ring installed on the cylinder block (1). The piston rod (2) passes through the central hole of the flexible packing ring. The outer side of the flexible packing ring and the cylinder block (1) enclose an annular closed cavity. The cylinder block (1) is also provided with a flow path (14) for introducing a pressure medium into the closed cavity.

2. The hydrogen compressor cylinder assembly according to claim 1, characterized in that, The packing seal assembly includes an annular groove (13) provided on the cylinder block (1). The annular groove (13) extends in the circumferential direction around the rod hole, and the inner side of the annular groove (13) is connected to the rod hole. The flexible packing ring is arranged in the annular groove (13). In the axial direction of the piston rod (2), both sides of the flexible packing ring are respectively in contact with different sides of the annular groove (13). In the radial direction of the piston rod (2), the piston rod (2) is located inside the flexible packing ring, and the outer side of the flexible packing ring and the annular groove (13) enclose the closed cavity. One end of the flow path (14) is located on the side surface of the cylinder block (1), and the other end of the flow path (14) is connected to the closed cavity.

3. A hydrogen compressor cylinder assembly according to claim 1, characterized in that, The liquid seal cavity (3) is an annular cavity coaxial with the rod hole. The cylinder block (1) is also provided with a liquid inlet channel for supplying liquid to the liquid seal cavity (3) and a liquid outlet channel for discharging liquid from the liquid seal cavity (3). It further includes a circulation pipeline (8). The liquid inlet channel, the liquid seal cavity (3), and the liquid outlet channel are all connected in series on the circulation pipeline (8). A temporary storage tank (9) and a circulation pump (10) are also connected in series on the circulation pipeline (8). The circulation pump (10) is used to extract ionic liquid from the temporary storage tank (9) and inject the ionic liquid into the liquid seal cavity (3). The temporary storage tank (9) is used to store the liquid discharged from the liquid seal cavity (3).

4. The hydrogen compressor cylinder assembly according to claim 3, wherein, One end of the cylinder block (1) far from the piston cavity is provided with an ionic liquid recovery cavity, and the packing seal assembly at this end is located between the ionic liquid recovery cavity and the liquid seal cavity (3). The cylinder block (1) is also provided with an ionic liquid recovery liquid path. The inlet of the ionic liquid recovery liquid path communicates with the ionic liquid recovery cavity, and the outlet of the ionic liquid recovery liquid path is connected to one end of a recovery pipeline (15). The other end of the recovery pipeline (15) is arranged to introduce the ionic liquid in the recovery pipeline (15) into the temporary storage tank (9).

5. The hydrogen compressor cylinder assembly according to claim 3, characterized in that, A pressure regulating valve (12) is connected in series on the circulation pipeline (8) between the liquid outlet channel and the temporary storage tank (9).

6. A hydrogen compressor cylinder assembly according to any one of claims 1 to 5, characterized in that, A third packing ring (6) is arranged in the gap at one end of the cylinder block (1) close to the piston cavity, and the packing seal assembly at this end of the cylinder block (1) is located between the liquid seal cavity (3) and the third packing ring (6). It further includes a packing pressing ring (7) for providing extrusion to the third packing ring (6). The packing pressing ring (7) is installed on the cylinder block (1) through a compression bolt.

7. A hydrogen compressor, characterized in that, It includes a hydrogen compressor cylinder assembly according to any one of claims 1 to 6.

8. A hydrogen compressor according to claim 7, wherein, It further includes a driving mechanism for driving the piston rod (2) to reciprocate. The driving mechanism includes a crosshead slider (16) connected to the piston rod (2) and slidingly fitted in the cylinder block (1).

9. A hydrogen compressor according to claim 7, characterized in that, The flow path (14) is conducted to the outlet side of the hydrogen compressor through a gas guide pipe.

10. A hydrogen compressor according to claim 9, characterized in that, A pressure reducing valve is also connected in series on the gas guide pipe.

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